Engine Error
P0406
Exhaust Gas Recirculation Sensor A Circuit High
Severity
Medium
Symptoms
Engine stalling, hesitation, rough idle, poor performance
Common Causes
- Short to voltage in EGR sensor circuit
- Failed EGR position sensor
- EGR valve stuck open due to carbon
- Poor ground connection
How to Fix
- 1 Repair short to battery voltage
- 2 Replace EGR valve/sensor assembly
- 3 Clean carbon from EGR valve
- 4 Fix ground wire
Estimated Repair Cost
USD
$50
–
$350
EGR cleaning: $80; EGR Replacement: $200 - $350